™If wash sale appears in a quote, filing or account screen, read it together with the instrument, timeframe and calculation method.
Taxes & Account Rules
Wash sale
A U.S. tax rule that can disallow a current loss when substantially identical stock or securities are acquired within the specified window.
Plain-English context
Why it matters
This term is part of the language used to describe ownership, pricing, transactions and investment outcomes.
Assuming Wash sale has one universal interpretation without checking the source, rules, timeframe or methodology.
Use current definitions. Product terms, tax treatment and market rules can change. Confirm important details with official disclosures, regulators and regulated providers.